\begin{tikzpicture} [every node/.style={anchor=south west,,inner sep=0}]
	\node [fill=red!5] (RINFL){
		\begin{tabular}{|C{4em}|C{4em}|C{4em}|}
			\hline 
			ID & OFF & TP  \\ 
			\hline
	\end{tabular}};	
	\node(tip)[draw,fill=green!10,inner sep=0.5em,rectangle callout,callout relative pointer={(-3em,-1.45em)},rounded corners = 0.3em,align=center] at ([xshift=-7em,yshift=2em]RINFL.east) {每个域占表中一个纪录};
\end{tikzpicture}